Microsoft Office 365, the follow-up to the company's Business Productivity Online Suite, is now available for beta testing. A full commercial launch is expected in 2011. With this release, Microsoft is betting big on the enterprise's desire for suite of products that combines the power and productivity options of the desktop with the convenience of the cloud. However, the flexibility that is the hallmark of the new solution also makes it confusing when it comes time to figure out which option you need. Microsoft is offering a slew of different Office 365 versions for small businesses, larger options, and educational institutions. In addition, the enterprise version features a range of pricing and service options designed for different groups of workers. Trying to figure out which of the many options make the most sense for your enterprise can be tricky. We've pored over the various details and plans, and assembled them into a readily understandable package to give you an overview of what you need to know about Office 365. Read on to learn key details surrounding Microsoft's latest productivity suite.